单项选择题


A．proposed
B．developed
C．supplied
D．offered
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单项选择题
A．employedB．createdC．operatedD．controlled
A．employed
B．created
C．operated
D．controlled
单项选择题
A．casesB．reasonsC．factorsD．situations
A．cases
B．reasons
C．factors
D．situations
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